I'm not sure why it took you so long. Cursed sword girls are on the second (Ikko) island. To be precise, in the old castle zone. To get their "lose" H scene all you need to do is fight with them and hit the surrender button. Based on Ada's lewd level, you will get a scene.
As for the download link, you can either use Itch for the public version of all supported platforms or my Patreon. It has both the public and patron versions. The latter has extra content.